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  <a name="EN-US_TOPIC_0000002200100353"></a><a name="EN-US_TOPIC_0000002200100353"></a>
  <h1 class="topictitle1">Failed to Execute a Hyper-V Backup Job and the Error Details Contain "Read File Failed, Error: 22"</h1>
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    <h4 class="sectiontitle">Symptom</h4>
    <p>A Hyper-V backup job fails to be executed, and the VM to be backed up cannot be started. A message is displayed, indicating that the disk file is occupied by another process. Assume you log in to the OceanProtect WebUI, choose <strong>Protection</strong> &gt; <strong>Clients</strong>, locate the row that contains the client, and export logs. The <strong>VirtualPlugin.log</strong> file contains "Read file failed, error: 22".</p>
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    <h4 class="sectiontitle">Possible Causes</h4>
    <p>The Hyper-V VM disk file to be backed up is occupied by another process of the Hyper-V host. As a result, an error is reported when the client reads the disk file during the backup process. The error message shows "22: ERROR_BAD_COMMAND The device does not recognize the command."</p>
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   <div class="section">
    <h4 class="sectiontitle">Troubleshooting</h4>
    <ol>
     <li><span>Log in to the Hyper-V host machine to be backed up.</span></li>
     <li><span>Open the Windows task manager. On the <span class="uicontrol"><b>Performance</b></span> tab page, click <strong>Open Resource Monitor</strong>.</span></li>
     <li><span>Switch to the <span class="uicontrol"><b>CPU</b></span> tab. On the <span class="uicontrol"><b>Associated Handles</b></span> tab page, search for the name of the occupied disk file. Obtain the disk file name from the error information about the VM startup job.</span></li>
     <li><span>Manually stop the process that occupies the disk file.</span></li>
     <li><span>Start the VM to be backed up and check whether the VM can start up properly.</span><p></p>
      <ul>
       <li>If yes, the fault is rectified.</li>
       <li>If no, contact Huawei technical support engineers.</li>
      </ul> <p></p></li>
    </ol>
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    <p></p>
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     <strong>Parent topic:</strong> <a href="en-us_topic_0000002164614056.html">FAQs</a>
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